package com.atguigu.gulimall.auth.controller;

import cn.hutool.core.util.RandomUtil;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @Author : Jungle
 * @Description :
 */
@Slf4j
@Controller
public class LoginController {
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private ThirdPartFeignService thirdPartFeignService;
    @Autowired
    private MemberFeignService memberFeignService;

    /**
     * 1、发送一个请求，跳转到一个页面
     * SpringMVC viewcontroller：将请求和页面映射过来
     */
    @ResponseBody
    @GetMapping("/send/sendCode")
    public R sendCode(@RequestParam("phone") String phone) {
        // TODO: 2022/7/18  接口防刷
        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)) {
            long time = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - time < 60000) {
                // 60秒内不能再发
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION.getCode(), BizCodeEnum.SMS_CODE_EXCEPTION.getMsg());
            }
        }
        //2、验证码再次校验 redis  存key-phone  value-code    sms:code:18949555420->123654
        String code = RandomUtil.randomNumbers(6);
        String substring = code + "_" + System.currentTimeMillis();
        //Redis缓存验证码  保存redis中5分钟有效
        //防止同一个手机号60s内再次发送验证码，加上系统时间
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, substring, 5, TimeUnit.MINUTES);

        thirdPartFeignService.sendCode(phone, code);
        return R.ok();
    }


    /**
     * todo: 重定向携带数据利用session原理  ，cookie中存储了一个jsessionid,将数据放到session中，只要跳到下一个页面以后，session里面的数据就会被删除掉
     * RedirectAttributes redirectAttributes  ：模拟重定向携带数据
     * <p>
     * <p>
     * todo 分布式session问题
     * <p>
     * 注册
     * 这里有对数据进行校验
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result, RedirectAttributes redirectAttributes) {
        //注册成功返回首页，或者登录页面
        if (result.hasErrors()) {
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));

            //model.addAttribute("errors", errors);
            redirectAttributes.addFlashAttribute("errors", errors);
            //Request method 'PoST not supported
            //用户注册-》regist[post] =>转发/reg/html (路径映射默认都是get方向访问),
            //解决方式：不要用转发，直接页面渲染


            //return "reg";  这种不能防止重复提交
            //两种方式都可以，下面一种多多饶了一圈    registry.addViewController("/reg.html").setViewName("reg");
            //校验出错转发到注册页面
            //return "forward:/reg.html";

            return "redirect:http://auth.gulimall.com/reg.html";  //这里需要带全路径，不然去ip找
        }

        //校验验证码
        String code = vo.getCode();
        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if (!StringUtils.isEmpty(s)) {
            if (code.equals(s.split("_")[0])) {
                // 删除验证码,令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
            // 验证码通过  //真正注册，调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                // 成功
                    return "redirect:http://auth.gulimall.com/login.html";
                }else {
                    //异常
                    HashMap<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg",new TypeReference<String>() {
                    }));
                    redirectAttributes.addFlashAttribute("errors",errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }

            } else {
                HashMap<String, String> errors = new HashMap<>();
                errors.put("code", "验证码错误");
                redirectAttributes.addFlashAttribute("code", errors);
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        }else {
            //验证码过期
            HashMap<String, String> errors = new HashMap<>();
            errors.put("code", "验证码错误");
            redirectAttributes.addFlashAttribute("code", errors);
            return "redirect:http://auth.gulimall.com/reg.html";

        }

    }
    /**
     * 如果已经登录成功了，再访问登录页面，直接跳转到首页
     */
    @GetMapping("/login.html")
    public String loginPage(HttpSession session){
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            return "login";
        }else {
            return "redirect:http://gulimall.com";
        }

    }



    /**
     * 因为页面传输的是k-v不是json不需要加@RequestBody
     * ,form表单不是用json传输,只有远程调用才是用http加json
     */
    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session){
        //远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() == 0) {
            MemberRespVo data = login.getData(new TypeReference<MemberRespVo>() {
            });
            //成功 放到session中
            session.setAttribute(AuthServerConstant.LOGIN_USER,data);
            //重定向到首页
            return "redirect:http://gulimall.com";
        }else {
            HashMap<String, String> errors = new HashMap<>();
            errors.put("msg", login.getData("msg",new TypeReference<String>() {
            }));
            redirectAttributes.addFlashAttribute("errors", errors);
            log.info("==>{}",errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }

    }



}
